Bicycle fixing frame

Abstract

The utility model relates to a bicycle fixing frame. The bicycle fixing frame comprises a supporting mechanism, a clamping mechanism and a rotation adjusting mechanism. The rotation adjusting mechanism comprises an adjusting seat fixedly connected to the supporting mechanism and a transverse rod structure fixedly connected to the clamping mechanism. A first locking part is arranged at the end, away from the clamping mechanism, of the transverse rod structure, and a second locking part matched with the first locking part is arranged at the end, facing the clamping mechanism, of the adjusting seat. The rotation adjusting mechanism further comprises a locking structure which applies mutual approaching force to the cross rod structure and the adjusting base so that the first locking part and the second locking part can be locked in an inserted mode. The first locking part comprises a plurality of protruding blocks, the second locking part comprises a plurality of grooves formed in the circumferential direction, or the first locking part comprises a plurality of grooves formed in the circumferential direction, and the second locking part comprises a plurality of protruding blocks. The bicycle fixing device has the effect of improving the bicycle fixing stability.

Description

Technical Field

[0001] The present application relates to the field of bicycle maintenance, and in particular to a bicycle fixing rack. Background Art

[0002] The bicycle repair stand can hold and fix the bicycle in mid-air to facilitate the repair of the bicycle. The repairman can stand to repair the bicycle, which is convenient for the repairman to repair the bicycle. It can also be used as a bicycle display stand.

[0003] At present, a bicycle repair rack includes a support frame, a column connected to the support frame, a connecting seat fixedly connected to the top of the column, a cylindrical cross bar connected to the connecting seat, and a clamping mechanism connected to one end of the cross bar, wherein the clamping mechanism is used to clamp and fix the bicycle; the connecting seat is provided with a mounting hole for the cross bar to pass through, and a movable opening connected to the mounting hole is provided at the top of the connecting seat, and the movable opening passes through the connecting seat along the axial direction of the cross bar. The connecting seat is provided with an adjusting bolt, which is arranged perpendicular to the axial direction of the cross bar, and the adjusting bolt passes through the connecting seat and connects the two sides of the movable opening. The size of the movable opening is controlled by turning the adjusting bolt, thereby adjusting the size of the clamping force of the connecting seat on the cross bar.

[0004] Regarding the above-mentioned related technologies, the inventor believes that the support is generally placed in the middle of the bicycle. The overall length of the bicycle is long. When force is applied to the bicycle from one end, the distance between the force application point and the support point is far, forming a long force arm, which makes the bicycle easy to rotate, thereby causing the problem of inconvenience in maintaining the bicycle. Utility Model Content

[0005] In order to improve the stability of a bicycle fixing rack in clamping a bicycle, the present application provides a bicycle fixing rack.

[0006] The bicycle fixing frame provided in this application adopts the following technical solution:

[0007] A bicycle fixing rack comprises a supporting mechanism, a clamping mechanism for clamping and fixing a bicycle, and a rotation adjustment mechanism having one end connected to the clamping mechanism and the other end connected to the supporting mechanism; the rotation adjustment mechanism comprises an adjustment seat fixedly connected to the supporting mechanism and a crossbar structure fixedly connected to the clamping mechanism;

[0008] A first locking portion is provided at one end of the cross bar structure away from the clamping mechanism, and a second locking portion adapted to the first locking portion is provided at one end of the adjustment seat facing the clamping mechanism. The rotation adjustment mechanism also includes a locking structure that applies a force to approach each other to the cross bar structure and the adjustment seat so that the first locking portion and the second locking portion are plugged and locked; the first locking portion includes a plurality of protrusions, and the second locking portion includes a plurality of circumferentially arranged grooves, or the first locking portion includes a plurality of circumferentially arranged grooves, and the second locking portion includes a plurality of protrusions.

[0009] By adopting the above technical solution, the bicycle is clamped and fixed by the clamping mechanism, and the protrusion and the groove are plugged into each other through the action of the locking structure, so that the first locking part and the second locking part are plugged into and locked, so as to limit the rotation of the cross bar structure relative to the adjustment seat, thereby alleviating the problem that the bicycle is easy to rotate when being repaired; compared with the method of limiting the rotation of the bicycle by friction only in the prior art, the above technical solution can better limit the rotation of the bicycle, thereby making it easier for maintenance personnel to repair the bicycle.

[0010] Optionally, the first locking portion is a first end face spline, and the second locking portion is a second end face spline.

[0011] By adopting the above technical solution, the first end face spline and the second end face spline are meshed to further limit the relative rotation between the cross bar structure and the adjustment seat.

[0012] Optionally, the locking structure includes a screw rod fixedly connected to the cross bar structure at one end and an adjusting nut threadedly connected to the screw rod, the adjusting seat is provided with a through hole for the screw rod to pass through, the screw rod is passed through the through hole and is slidably connected to the adjusting seat, and the adjusting nut abuts against the end face of the adjusting seat away from the cross bar structure.

[0013] By adopting the above technical solution, by rotating the adjusting nut, pressure is applied to the crossbar structure and the adjusting seat to move closer to each other, so that the first locking part and the second locking part fit more closely, thereby increasing the locking force between the two.

[0014] Optionally, the locking structure further includes a first spring, one end of the first spring abuts against the cross bar structure, and the other end of the first spring abuts against the adjustment seat, and the first spring is in a squeezed state when the first locking portion and the second locking portion are plugged into each other.

[0015] By adopting the above technical solution, when it is necessary to adjust the clamping angle of the bicycle, the adjusting nut can be loosened. Under the action of the spring, the crossbar structure moves to the side away from the adjustment seat, and the first locking part and the second locking part are separated. At this time, the bicycle can be rotated and adjusted to a suitable position, and then the adjusting nut is tightened to re-lock the crossbar structure and the adjustment seat.

[0016] Optionally, the crossbar structure includes a connecting crossbar and a connecting block provided with a first end face spline, one end of the connecting crossbar is polygonal, and an end of the connecting block away from the first locking portion is provided with a polygonal groove adapted to the polygonal end of the connecting crossbar.

[0017] By adopting the above technical solution, the cross bar and the connecting block are separated, and the first locking portion is located on the connecting block, which facilitates the processing of the first locking portion.

[0018] Optionally, the connecting cross bar is a metal tube, one end of the connecting cross bar that is polygonal is integrally formed with an end face, and one end of the screw rod is welded to the end face of the connecting cross bar.

[0019] By adopting the above technical solution, the connection structure between the cross rod and the screw rod has sufficient strength and the connection method is simple.

[0020] Optionally, the clamping mechanism includes a clamping seat fixedly connected to the crossbar structure, a movable block hinged to the clamping seat, and a force-applying component that applies pressure to the movable block to rotate the movable block toward the clamping seat.

[0021] By adopting the above technical solution, the bicycle is placed between the movable block and the clamping seat, and the movable block and the clamping seat clamp and fix the bicycle under the action of the force-applying component.

[0022] Optionally, the force-applying assembly includes a pull rod and a cam member, the cam member is rotatably connected to one end of the pull rod, the cam member is provided with a locking surface and an unlocking surface, the normals of the locking surface and the unlocking surface are perpendicular to the rotation center of the cam member, and the distance between the locking surface and the rotation center of the cam member is greater than the distance between the unlocking surface and the rotation center of the cam member.

[0023] By adopting the above technical solution, when the bicycle needs to be locked, the cam part is rotated so that the locking surface abuts against the movable block; when the bicycle needs to be removed, the cam part is rotated so that the unlocking surface faces the movable part, thereby giving the movable block a larger movable space and quickly releasing the lock on the bicycle.

[0024] Optionally, the clamping seat and the movable block have V-shaped placement grooves on the facing sides thereof, and the movable block rotates toward the clamping seat under the action of the force-applying component, and the groove surfaces of the two placement grooves are used to clamp and fix the bicycle.

[0025] By adopting the above technical solution, the stability of the bicycle supported by the clamping mechanism is increased.

[0026] Optionally, the force-applying assembly further includes a second spring, one end of the second spring abuts against the movable block, and the other end of the second spring abuts against the clamping seat.

[0027] By adopting the above technical solution, after the force-applying assembly no longer applies force to the movable block, the movable block rotates in a direction away from the clamping seat under the action of the spring, so that the bicycle can be easily removed.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The relative rotation between the crossbar structure and the adjustment seat is limited by inserting and locking the first locking portion and the second locking portion, thereby alleviating the problem of easy rotation during bicycle maintenance.

[0030] 2. The locking structure includes a screw rod fixedly connected to the cross bar structure at one end, an adjusting nut threadedly connected to the screw rod, and a spring. By rotating the adjusting nut, pressure is applied to the cross bar structure and the adjusting seat to move closer to each other, thereby increasing the locking force between the two. When the bicycle clamping angle needs to be adjusted, the adjusting nut can be loosened. Under the action of the spring, the first locking part and the second locking part are separated, and the bicycle can be rotated. After the adjustment is complete, the adjusting nut is tightened to complete the locking.

[0031] 3. The force-applying assembly includes a pull rod and a cam member. The cam member is provided with a locking surface and an unlocking surface. The normals of the locking surface and the unlocking surface are arranged perpendicularly to the rotation center of the cam member. The bicycle can be quickly fixed by rotating the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an axonometric view of the embodiment of the present application for showing the overall structure of the fixing frame.

[0033] Figure 2 It is a schematic diagram of an embodiment of the present application for demonstrating a supporting mechanism.

[0034] Figure 3 It is a schematic diagram of an embodiment of the present application for demonstrating a rotation adjustment mechanism.

[0035] Figure 4 It is an exploded view of the embodiment of the present application for demonstrating the rotation adjustment mechanism.

[0036] Figure 5 It is a cross-sectional view of an embodiment of the present application for demonstrating the clamping mechanism.

[0037] Description of reference numerals: 100, support mechanism; 110, bottom bracket; 111, center tube; 112, sliding seat; 113, support foot; 114, intermediate connecting rod; 115, first adjusting bolt; 116, second adjusting bolt; 120, support rod; 200, clamping mechanism; 210, clamping seat; 211, slot; 212, opening; 213, locking bolt; 215, flat key; 216, placement slot; 220, movable block; 230, force application assembly; 231, pull rod; 232, pull rod; 233, pull rod; 234, pull rod; 235, pull rod; 236, pull rod; 237, pull rod; 238, pull rod; 239, pull rod; 240, pull rod; 241, pull rod; 242, pull rod; 243, pull rod; 244, pull rod; 245, pull rod; 246, pull rod; 247, pull rod; 248, pull rod; 249, pull rod; 250, pull rod; 251, pull rod; 252, pull rod; 253, pull rod; 254, pull rod; 255, pull rod; 256, pull rod; 257, pull rod; 258, pull rod; 259, pull rod; 260, pull rod; 261, pull rod; 262, pull rod; 263, pull rod; 264, pull rod; 265, pull rod; 266, pull rod; 267, pull rod; 268, pull rod; 269, pull rod; 270, pull rod; 271, pull rod; 272, pull rod; 273, pull rod; 274, pull rod; 27 2. Clamping bolt; 234. Waist hole; 235. Cam member; 236. Locking surface; 237. Unlocking surface; 238. Second spring; 300. Rotation adjustment mechanism; 310. Adjustment seat; 311. Second locking part; 312. Through hole; 320. Crossbar structure; 321. Connecting crossbar; 322. Connecting block; 323. Polygonal groove; 324. First locking part; 325. Keyway; 330. Locking structure; 331. Screw; 332. Adjustment nut; 333. First spring. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-5 This application is described in further detail.

[0039] The present application embodiment discloses a bicycle fixing rack. Figure 1 , the fixing frame comprises:

[0040] The support mechanism 100 is used to be placed on the ground to maintain the stability of the entire fixing frame;

[0041] A clamping mechanism 200, used for clamping and locking a bicycle;

[0042] The rotation adjustment mechanism 300 has one end fixedly connected to the clamping mechanism 200 and the other end fixedly connected to the supporting mechanism 100 .

[0043] Reference Figure 2 In the embodiment of the present application, the support mechanism 100 includes a bottom bracket 110 and a support rod 120 fixed to the bottom bracket 110. The bottom bracket 110 includes a center tube 111, a sliding seat 112 sleeved on the center tube 111, and a support leg 113 hinged to the sliding seat 112. There are multiple support legs 113, and they are arranged circumferentially along the center tube 111 as the center. An intermediate connecting rod 114 is hinged to the middle position of the support leg 113 in the length direction, and the other end of the intermediate connecting rod 114 is hinged to the bottom of the center tube 111. When the sliding seat 112 moves up and down along the center tube 111, the angle between the support leg 113 and the center tube 111 can be adjusted.

[0044] Reference Figure 2The sliding seat 112 is threadedly connected with a first adjusting bolt 115, and the first adjusting bolt 115 is used to lock the sliding seat 112 to the central tube 111, so as to lock the angle between the supporting leg 113 and the central tube 111 and limit the rotation of the supporting leg 113.

[0045] Reference Figure 2 The support rod 120 is inserted into the central tube 111, and the two can slide relative to each other. The upper end of the support rod 120 extends out of the central tube 111 and is used to be fixedly connected to the rotation adjustment mechanism 300. The upper part of the central tube 111 is threadedly connected with a second adjustment bolt 116, which is used to lock the central tube 111 and the support rod 120. When the second adjustment bolt 116 is tightened, the sliding between the central tube 111 and the support rod 120 can be limited.

[0046] Reference Figure 3 , the rotation adjustment mechanism 300 comprises:

[0047] The adjustment seat 310 is fixedly connected to the support mechanism 100. The adjustment seat 310 is sleeved on the top of the support rod 120, and the two are fixedly connected by bolts;

[0048] The crossbar structure 320 is fixedly connected to the clamping mechanism 200;

[0049] Locking structure 330 (refer to Figure 4 ), apply pressure to the cross bar structure 320 and the adjustment seat 310 to bring the two closer to each other and lock them to limit the relative rotation of the cross bar structure 320 and the adjustment seat 310.

[0050] Reference Figure 4 , wherein the crossbar structure 320 includes a connecting crossbar 321 and a connecting block 322. One end of the connecting crossbar 321 is used for fixed connection with the clamping mechanism 200, and one end thereof is polygonal. In this embodiment, the other end of the connecting crossbar 321 is square in cross section. The polygonal end of the connecting crossbar 321 is integrally formed with an end face. A polygonal groove 323 adapted to the polygonal end of the connecting crossbar 321 is provided at one end of the connecting block 322. The polygonal end of the connecting crossbar 321 is inserted into the polygonal groove 323 of the connecting block 322 to limit the relative rotation of the two. The connecting crossbar 321 is a metal tube, and a stainless steel tube is used in this embodiment.

[0051] Reference Figure 4, a first locking portion 324 is provided at one end of the connecting block 322 away from the connecting cross bar 321, and a second locking portion 311 is provided at one end of the adjusting seat 310 facing the clamping mechanism 200. In this embodiment, the first locking portion 324 is a first end face spline, and the second locking portion 311 is a second end face spline. Under the action of the locking structure 330, the cross bar structure 320 and the adjusting seat 310 are brought close to each other so that the first end face spline and the second end face spline are plugged and locked, so as to limit the relative rotation of the cross bar structure 320 and the adjusting seat 310.

[0052] The first locking portion 324 and the second locking portion 311 may also be in other forms, such as:

[0053] The first locking portion 324 includes a plurality of protrusions, and the second locking portion 311 includes a plurality of grooves arranged circumferentially;

[0054] Alternatively, the first locking portion 324 includes a plurality of grooves arranged circumferentially, and the second locking portion 311 includes a plurality of protrusions.

[0055] Reference Figure 4 The locking structure 330 includes a screw rod 331 having one end fixedly connected to the cross bar structure 320 and an adjusting nut 332 threadedly connected to the screw rod 331. One end of the screw rod 331 is welded to the polygonal end face of the connecting cross bar 321, and the other end passes through the connecting block 322 and the adjusting seat 310, and extends out of the end of the adjusting seat 310 away from the second locking portion 311. The adjusting seat 310 is provided with a through hole 312 for the screw rod 331 to pass through. The adjusting nut 332 abuts against the end of the adjusting seat 310 away from the second locking portion 311. Tightening the adjusting nut 332 applies pressure to the cross bar structure 320 and the adjusting seat 310 to move closer to each other, so that the first locking portion 324 and the second locking portion 311 fit tightly.

[0056] Reference Figure 4 and Figure 5 The locking structure 330 also includes a first spring 333 sleeved on the screw rod 331 .

[0057] One end of the first spring 333 abuts against the connecting block 322, and the other end abuts against the adjusting seat 310. When the first end face spline and the second end face spline are meshed, the first spring 333 is in an extruded state. In this embodiment, the through hole 312 of the adjusting seat 310 is a stepped hole. One end of the first spring 333 away from the connecting block 322 abuts against the stepped surface of the stepped hole. When the angle of the bicycle clamping needs to be adjusted, the adjusting nut 332 can be loosened. Under the action of the first spring 333, the crossbar structure 320 moves to the side away from the adjusting seat 310, and the first locking portion 324 and the second locking portion 311 are separated. At this time, the bicycle can be rotated, and after adjusting to a suitable position, the adjusting nut 332 can be tightened to re-lock the crossbar structure 320 and the adjusting seat 310.

[0058] Reference Figure 5 The clamping mechanism 200 includes a clamping seat 210 fixedly connected to the crossbar structure 320, a movable block 220 hinged to the clamping seat 210, and a force-applying component 230 that applies pressure to the movable block 220 to rotate the movable block 220 toward the clamping seat 210.

[0059] Reference Figure 5 , wherein the clamping seat 210 is provided with a slot 211 for accommodating the connecting cross bar 321, and an opening 212 is provided at one end of the clamping seat 210, and the opening 212 is communicated with the slot 211. The clamping seat 210 is provided with a locking bolt 213, which passes through the parts of the clamping seat 210 located on both sides of the opening 212 and is threadedly connected with a nut. When the locking bolt 213 is tightened, the width of the opening 212 is reduced, so that the clamping seat 210 tightly embraces the connecting cross bar 321, thereby achieving the fixation of the clamping seat 210 and the connecting cross bar 321.

[0060] Reference Figure 5 In order to limit the relative rotation between the connecting cross bar 321 and the clamping seat 210, a flat key 215 is integrally formed on the inner wall of the slot 211, and a key slot 325 is provided at one end of the connecting cross bar 321 inserted into the slot 211. When the connecting cross bar 321 is placed in the slot 211, the flat key 215 is placed in the key slot 325 to limit the relative rotation between the connecting cross bar 321 and the clamping seat 210.

[0061] Reference Figure 5 In order to increase the stability of the clamping mechanism 200 in clamping the bicycle, V-shaped placement grooves 216 are provided on the facing sides of the clamping seat 210 and the movable block 220. The movable block 220 rotates toward the clamping seat 210 under the action of the force-applying component 230, and the groove surfaces of the two placement grooves 216 are used to clamp and fix the bicycle.

[0062] Reference Figure 5 The force-applying assembly 230 includes a pull rod 231. The pull rod 231 includes a clamping bolt 232, which passes through the movable block 220 and the clamping seat 210 in sequence and is then threadedly connected with a nut. In order to provide a movable space between the clamping bolt 232 and the movable block 220, the movable block 220 is provided with a waist hole 234 for the clamping bolt 232 to pass through, and the length direction of the waist hole 234 is perpendicular to the rotation center of the clamping bolt 232.

[0063] Reference Figure 5The force-applying assembly 230 further includes a cam member 235 hinged to the top of the pull rod 231. The cam member 235 is in the shape of a long strip, and a locking surface 236 and an unlocking surface 237 are arranged at one end close to the pull rod 231. The normals of the locking surface 236 and the unlocking surface 237 are arranged perpendicular to the rotation center of the cam member 235, and the distance between the locking surface 236 and the rotation center of the cam member 235 is greater than the distance between the resolution surface and the rotation center of the cam member 235. When the bicycle needs to be locked, the cam member 235 is rotated, and the locking surface 236 abuts against the movable block 220; when the bicycle needs to be removed, the cam member 235 is rotated to make the unlocking surface 237 face the movable member, so that the movable block 220 has a larger activity space, and the locking fixation of the bicycle is quickly released.

[0064] Reference Figure 5 The force-applying assembly 230 further includes a second spring 238 sleeved on the pull rod 231, one end of the second spring 238 abuts against the movable block 220, and the other end abuts against the clamping seat 210. After the force-applying assembly 230 applies force to the movable block 220, under the action of the second spring 238, the movable block 220 rotates away from the clamping seat 210, so as to facilitate the removal of the bicycle.

[0065] The implementation principle of a bicycle fixing rack in the embodiment of the present application is as follows: a bicycle is placed in the placement groove 216 of the clamping seat 210, and then the cam member 235 is rotated so that the locking surface 236 abuts against the movable block 220, thereby pushing the movable block 220 to rotate toward the clamping seat 210, and the groove surfaces of the two placement grooves 216 are used to clamp and fix the bicycle.

[0066] The adjusting nut 332 abuts against one end of the adjusting seat 310 away from the second locking portion 311, and applies pressure to the crossbar structure 320 and the adjusting seat 310 to approach each other, so that the first locking portion 324 and the second locking portion 311 fit closely. The first locking portion 324 is a first end face spline, and the second locking portion 311 is a second end face spline. Under the action of the locking structure 330, the crossbar structure 320 and the adjusting seat 310 are brought close to each other so that the first end face spline and the second end face spline are plugged and locked, so as to limit the relative rotation of the crossbar structure 320 and the adjusting seat 310.

[0067] When the bicycle clamping angle needs to be adjusted, the adjusting nut 332 can be loosened. Under the action of the first spring 333, the cross bar structure 320 moves to the side away from the adjustment seat 310, and the first locking portion 324 and the second locking portion 311 are separated. At this time, the bicycle can be rotated and adjusted to a suitable position, and then the adjusting nut 332 is tightened to re-lock the cross bar structure 320 and the adjustment seat 310.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bicycle fixing rack, characterized in that: The invention comprises a support mechanism (100), a clamping mechanism (200) for clamping a bicycle, and a rotation adjustment mechanism (300) having one end connected to the clamping mechanism (200) and the other end connected to the support mechanism (100); the rotation adjustment mechanism (300) comprises an adjustment seat (310) fixedly connected to the support mechanism (100) and a crossbar structure (320) fixedly connected to the clamping mechanism (200); A first locking portion (324) is provided at one end of the crossbar structure (320) away from the clamping mechanism (200), and a second locking portion (311) adapted to the first locking portion (324) is provided at one end of the adjustment seat (310) facing the clamping mechanism (200). The rotation adjustment mechanism (300) further comprises a locking structure (330) for applying a force to the crossbar structure (320) and the adjustment seat (310) to bring them closer to each other so that the first locking portion (324) and the second locking portion (311) are plugged and locked; the first locking portion (324) comprises a plurality of protrusions, and the second locking portion (311) comprises a plurality of grooves arranged circumferentially, or the first locking portion (324) comprises a plurality of grooves arranged circumferentially, and the second locking portion (311) comprises a plurality of protrusions.

2. A bicycle fixing rack according to claim 1, characterized in that: The first locking portion (324) is a first end face spline, and the second locking portion (311) is a second end face spline.

3. The bicycle fixing rack according to claim 1, characterized in that: The locking structure (330) comprises a screw rod (331) having one end fixedly connected to the cross bar structure (320) and an adjusting nut (332) threadedly connected to the screw rod (331); the adjusting seat (310) is provided with a through hole (312) for the screw rod (331) to pass through; the screw rod (331) is passed through the through hole (312) and is slidably connected to the adjusting seat (310); and the adjusting nut (332) abuts against an end surface of the adjusting seat (310) away from the cross bar structure (320).

4. A bicycle fixing rack according to claim 3, characterized in that: The locking structure (330) further comprises a first spring (333), one end of the first spring (333) abutting against the crossbar structure (320), and the other end of the first spring (333) abutting against the adjustment seat (310), and when the first locking portion (324) and the second locking portion (311) are plugged together, the first spring (333) is in a squeezed state.

5. The bicycle fixing rack according to claim 3, characterized in that: The crossbar structure (320) comprises a connecting crossbar (321) and a connecting block (322) provided with a first end face spline, one end of the connecting crossbar (321) is polygonal, and one end of the connecting block (322) away from the first locking portion (324) is provided with a polygonal groove (323) adapted to the polygonal end of the connecting crossbar (321).

6. A bicycle fixing rack according to claim 5, characterized in that: The connecting cross bar (321) is a metal tube, and one end of the connecting cross bar (321) is in a polygonal shape and has an end face integrally formed thereon, and one end of the screw rod (331) is welded to the end face of the connecting cross bar (321).

7. The bicycle fixing rack according to claim 1, characterized in that: The clamping mechanism (200) comprises a clamping seat (210) fixedly connected to the crossbar structure (320), a movable block (220) hinged to the clamping seat (210), and a force-applying component (230) for applying pressure to the movable block (220) to rotate the movable block (220) toward the clamping seat (210).

8. The bicycle fixing rack according to claim 7, characterized in that: The force-applying assembly (230) comprises a pull rod (231) and a cam member (235), wherein the cam member (235) is rotatably connected to one end of the pull rod (231), and the cam member (235) is provided with a locking surface (236) and an unlocking surface (237), wherein the normals of the locking surface (236) and the unlocking surface (237) are arranged perpendicular to the rotation center of the cam member (235), and the distance between the locking surface (236) and the rotation center of the cam member (235) is greater than the distance between the unlocking surface (237) and the rotation center of the cam member (235).

9. The bicycle fixing rack according to claim 7, characterized in that: The clamping seat (210) and the movable block (220) are both provided with V-shaped placement grooves (216) on the facing sides thereof. The movable block (220) rotates toward the clamping seat (210) under the action of the force applying assembly (230). The groove surfaces of the two placement grooves (216) are used to clamp and fix the bicycle frame.

10. The bicycle fixing rack according to claim 8, characterized in that: The force-applying assembly (230) further comprises a second spring (238), one end of the second spring (238) being in contact with the movable block (220) and the other end of the second spring (238) being in contact with the clamping seat (210).

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